<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<link rel="stylesheet" type="text/css" href="样式.css" />
	</head>
	<body>
		<h3 class="c1">1</h3>
		<h3 class="c1">2</h3>
		<h3 class="c2 c3">3</h3>
		<h3 class="c3">4</h3>

		<h3 style="font-size: 50px;color: yellow; background-color: black;">选择器</h3>
		<h3 id="tz">1</h3>
		<h3 id="tz">2</h3>
		<h3 id="tz">3</h3>
		<p>0</p>
		<p>一个</p>
		<p class="intor">1</p>
		<p class="intor">2</p>
		<div>
			<p>3</p>
			<p>4</p>
			<p>5</p>
			<p>6</p>
		</div>
		<div>7</div>
		<p>8</p>

	</body>
</html>